package gs.hex.v0

import java.security.SecureRandom
import java.util.UUID

class EncodeDecodeTests extends munit.FunSuite:

  val Rng       = new SecureRandom()
  val MinLength = 1
  val MaxLength = 100

  test("should encode/decode using summoners") {
    (0 to 10).foreach { _ =>
      val data    = randomByteArray()
      val encoded = HexEncode[Array[Byte]].toHexString(data)
      val decoded = HexDecode[Array[Byte]].fromHexString(encoded)
      assert(decoded.isDefined)
      assert(decoded.map(_.sameElements(data)).getOrElse(false))
    }
  }

  test("should encode/decode byte arrays") {
    (0 to 10).foreach { _ =>
      val data    = randomByteArray()
      val encoded = encode(data)
      val decoded = decode[Array[Byte]](encoded)
      assert(decoded.isDefined)
      assert(decoded.map(_.sameElements(data)).getOrElse(false))
    }
  }

  test("should encode/decode strings") {
    (0 to 10).foreach { _ =>
      val data    = UUID.randomUUID().toString()
      val encoded = encode(data)
      val decoded = decode[String](encoded)
      assert(decoded == Some(data))
    }
  }

  test("should encode/decode boolean values") {
    val et = encode(true)
    val dt = decode[Boolean](et)
    assert(dt == Some(true))
    val ef = encode(false)
    val df = decode[Boolean](ef)
    assert(df == Some(false))
  }

  test("should encode/decode integers") {
    (0 to 10).foreach { _ =>
      val data    = Rng.nextInt(9999)
      val encoded = encode(data)
      val decoded = decode[Int](encoded)
      assert(decoded == Some(data))
    }
  }

  test("should encode/decode longs") {
    (0 to 10).foreach { _ =>
      val data    = Rng.nextLong(9999L)
      val encoded = encode(data)
      val decoded = decode[Long](encoded)
      assert(decoded == Some(data))
    }
  }

  test("should fail to decode invalid data to byte arrays") {
    assert(decode[Array[Byte]]("!") == None)
  }

  test("should fail to decode invalid data to strings") {
    assert(decode[String]("!") == None)
  }

  test("should fail to decode invalid data to bools") {
    assert(decode[Boolean]("!") == None)
  }

  test("should fail to decode invalid data to integers") {
    assert(decode[Int]("!") == None)
  }

  test("should fail to decode invalid data to longs") {
    assert(decode[Long]("!") == None)
  }

  private def encode[A](
    data: A
  )(
    using
    H: HexEncode[A]
  ): String = H.toHexString(data)

  private def decode[A](
    data: String
  )(
    using
    H: HexDecode[A]
  ): Option[A] = H.fromHexString(data)

  private def randomByteArray(): Array[Byte] =
    val length = Rng.nextInt(MaxLength) + MinLength
    val bytes  = new Array[Byte](length)
    val _      = Rng.nextBytes(bytes)
    bytes